The hypothesis of this study is that consciously sedated patients suffering from ST-elevation myocardial infarction can be rapidly and safely cooled to a state of therapeutic hypothermia (32 to 34 degrees C) using the LRS ThermoSuit System prior to percutaneous coronary intervention.

This clinical study will investigate the safety and feasibility of cooling heart attack (STEMI) patients with the LRS (Life Recovery Systems)ThermoSuit System, a cooling device which uses the principle of cold water immersion to rapidly reduce patient temperature. The study will enroll a total of up to 20 patients, and will be a cooperative effort between LRS and LSU Health Sciences Center - Shreveport.

The study is being conducted under an IDE (Investigational Device Exemption) that was granted to LRS by FDA (G070141). The primary goal of this trial is to demonstrate the feasibility of cooling AMI patients pre-reperfusion with the ThermoSuit cooling device. The safety of this treatment will be determined by review of a composite of serious adverse events.

Consciously sedated patients will be cooled after entry into the emergency room and prior to percutaneous coronary intervention in the catheterization laboratory. It is hypothesized that the ThermoSuit System will enable cooling of the patient to 34ºC after a treatment of 30 minutes or less. Previous research has suggested that cooling of ST-elevation myocardial infarction patients before coronary reperfusion could result in a significant reduction in myocardial infarct size.

If successful, this study will lead to a pivotal clinical study to investigate the potential for the ThermoSuit cooling treatment to reduce myocardial infarct size. The ultimate goal of these studies is to determine the safety and effectiveness of the use of the ThermoSuit device for the treatment of AMI patients.

Inclusion Criteria:

• Age ≥ 18 years.
• Duration of MI symptoms ≥ 30 minutes to ≤ 6 hours.
• ST-segment elevation of ≥ 1mm or more in two or more contiguous leads.
• Eligible for PCI.
• Willingness of patient or legal guardian to provide written, informed consent.
• Patient dimension criteria:
• Height: 147-190 cm (58 - 75 in)
• Width: ≤73 cm (29 in) (elbow to elbow)

Exclusion Criteria:

• Cardiac arrest or previous MI within one month.
• Administration of thrombolytics.
• Cardiogenic shock (systolic blood pressure (SBP) < 80 mmHg for > 30 minutes or SBP < 100 mmHg on vasopressors or IABP) in the absence of bradycardia or other correctable causes.
• Known hypersensitivity to hypothermia including Raynaud's disease or cryoglobulinemia.
• Severe allergy or contraindication to aspirin, Plavix, heparin, or contrast media which cannot be adequately pre-medicated.
• History of bleeding diathesis or coagulopathy or refusal of blood transfusions.
• Pregnancy.
• Known hypersensitivity midazolam, meperidine, buspirone, or magnesium sulfate.
• Current enrollment in another clinical trial (other than registry).
• Temperature < 35°C on admission to Emergency Department.
• Recent (< 1 week) surgical incisions.